CN1513110A - Flowmeter providing device and method - Google Patents

Flowmeter providing device and method Download PDF

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Publication number
CN1513110A
CN1513110A CNA028109163A CN02810916A CN1513110A CN 1513110 A CN1513110 A CN 1513110A CN A028109163 A CNA028109163 A CN A028109163A CN 02810916 A CN02810916 A CN 02810916A CN 1513110 A CN1513110 A CN 1513110A
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China
Prior art keywords
flowmeter
fluid
check
flow
flowmeters
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Granted
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CNA028109163A
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Chinese (zh)
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CN1237332C (en
Inventor
Mά
M·安东尼杰维克
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Micro Motion Inc
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Micro Motion Inc
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Publication of CN1513110A publication Critical patent/CN1513110A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
    • G01F1/8468—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits
    • G01F1/8472—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/18—Supports or connecting means for meters
    • G01F15/185—Connecting means, e.g. bypass conduits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
    • G01F25/13—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters using a reference counter

Abstract

A flowmeter proving device and method for use in proving a flowmeter in situ under operating conditions comprises a pair of standard Coriolis based mass flowmeters (2, 3) which are connected together in series by a conduit (7) connecting the fluid outlet (23) of the first flowmeter (2) to the fluid inlet (32) of the second flowmeter (3). A valved fluid supply conduit (4) is connected to the fluid inlet (22) of the first flowmeter (2), and a valved fluid return conduit (8) is connected to the fluid outlet (33) of the second flowmeter (3). These supply and return conduits (4 and 8) enable the device to be connected to a fluid flow line containing a flowmeter which is to be proved such that fluid flowing in the flow line will flow in series through the flowmeter to be proved and the two flowmeters (2 and 3) of the proving device. The device includes control means which is operative to use the second flowmeter (3) as a master meter to check the accuracy of the flowmeter to be proved, and the first flowmeter (2) as a check meter for the master meter (3).

Description

Flowmeter verifying attachment and method
Technical field
The present invention relates to a kind of flowmeter verifying attachment and method that is used for field test flowmeter under the practical operation condition.
Background technology
This device is mainly used to the quality inspection flowmeter, and Coriolis mass flowmeter particularly anyly is placed on the operating position that fluid flows usually and has the precision of the flowmeter of measuring inside or external fluid performance but can be used for checking.This flowmeter comprises picnometer, viscosity meter and volume flow meter and mass flowmeter.
The Coriolis mass flowmeter is known, and discloses in a plurality of patents of for example U.S. Patent No. 4444059 and 4422338, and wherein all patents have been described and used vibrating tube to produce the Coriolis effect mass flow meter relevant with mass rate.U.S. Patent No. 4491009 is described a kind of vibrating tube picnometer according to the Coriolis mass flowmeter.The ability of Coriolis effect mass flow meter density measurement can be determined volume flow by density value simply being divided into mass flow value.Be well known that also the Coriolis effect flowmeter can be used as the viscosity meter operation.
Through be usually used in carry and the operation of metering now by the confined gas of many different types of fluids of LPG (liquefied petroleum gas (LPG)) and other hydrocarbons particularly for the Coriolis mass flowmeter.For these application, usually determine 0.5% or even 0.1% flowmeter accuracy, need periodically check flowmeter, provide the flow measuring data in the flowmeter certain accuracy claimed range so that guarantee flowmeter, if not above situation, reset the correction coefficient of flowmeter.This correction coefficient is that flowmeter is used for the electronic signal that flowmeter produces is converted to the coefficient of the direct measured value of quality, volume or other desired parameters.The Coriolis flowmeter is linear flowmeter, and wherein the flux modification coefficient is a steady state value with respect to flow.
The method of inspection generally includes dismantles flowmeter so that be transported in the testing apparatus of clearing up, repairing flowmeter (if desired) from operation, and through thermometrically.Usually this relates to the operating weight shunt system, makes to have accurately known inside or the standard flow of external fluid performance (for example temperature, density, speed and volume) flows through the flowmeter that will test.The flowmeter that will test carries out flow measurement for fluid, and these are measured with known fluid property and intersect check.
But operating weight shunt system sensed flow meter is time-consuming relatively, and the cost height, and this system itself occupies sizable space.By reducing institute's spended time, space and money according to the point-device flowmeter of gravimetric analysis standard correction (being proving flowmeter) that is used for proofreading and correct the flowmeter in other tests subsequently.For test, the flowmeter of standard is connected so that carry out flow measurement simultaneously with the flowmeter in the test.For identical fluid displacement, come the measurement data of the flowmeter in the self-test and calculate together so that provide or confirm the flux modification coefficient of the flowmeter that is used for testing from the metrical information of proving flowmeter.The error that metering industry requires proving flowmeter output usually is at least less than 3 times of the accuracy requirement of the flowmeter in the test.Therefore, flow accuracy is set in 0.1% sensed flow meter needs precision to be at least 0.033% proving flowmeter so that check and proofread and correct purpose.
As mentioned above, the method for inspection of most of current employings relates to the flowmeter that will test from the fluid line dismounting of operation.If but can will have special advantage by the field test flowmeter, this is that this operating conditions for example is mechanical stress, pipe configuration, mobile variation, hydrodynamic pressure and variation of ambient temperature and the fluid components on the flowmeter owing to can compensate the operating conditions that influences flowmeter repeatability precision and performance automatically.A kind of known field test method relates to uses the device that is called " compact calibrating device ", but it is a device in volume, and needs to measure the attachment device of fluid density mass flow measurement for confirmation.This device is also quite big and cost is high.
Summary of the invention
Therefore, one object of the present invention is to provide a kind of flowmeter verifying attachment that is used for field test flowmeter under operating conditions, and the simple to operate and relative compact of this device, cost are low.
For this reason, the invention provides a kind of flowmeter verifying attachment, this device comprises the first and second standard C oriolis mass flowmeters that are corrected to the predetermined accuracy requirement, the fluid egress point of connection first flow meter and the fluid intake of second flowmeter are so that the device of the described flowmeter of connecting, make this device be connected to supply and return conduit that the fluid in the fluid line on the fluid line that contains the flowmeter that will check is crossed sequential flow in described first and second flowmeters of the described flowmeter that will check and verifying attachment on the fluid egress point of the fluid intake of first flow meter and second flowmeter thereby be connected to, be used to be connected on described first and second flowmeters and the described flowmeter that will check so that therefrom receive the control device of flow measurement signal, described control device can be operated so that use one of described first and second flowmeters as the main flow meter of the precision of checking the flowmeter that will check and use another check meters as described main flow meter of described first and second flowmeters.
Preferably, this first and second flowmeter is roughly the same, and this device will be used for proofreading and correct measure-alike flowmeter with regard to its nominal flow rate scope, and this nominal flow rate scope is corresponding with the flow range that first and second proving flowmeters of verifying attachment have been corrected to predetermined accuracy.For example, have 10～40kg/ minute the flowrate optimization scope and the operate flow meter of 0.1% accuracy requirement and need following verifying attachment, first and second flowmeters have 10～40kg/ minute flowrate optimization scope equally in this device, but this first and second flowmeter has been corrected to the error less than the specific precision of the flowmeter that will test.Usually, if when this device is used for checking the flowmeter with 0.1% accuracy requirement, the proving flowmeter of verifying attachment can be corrected to about 0.03% or littler error be acceptable.
In the use, when if the fluid line that contains the flowmeter that will check has cooperated with the verifying attachment web member of band valve, when testing for the flowmeter on the fluid line, the supply of verifying attachment of the present invention and return conduit will be connected on the verifying attachment web member simply.Shut-off valve in the fluid line between the verifying attachment web member then cuts out, and makes the interior fluid sequence that flows of fluid line flow through first and second flowmeters of verifying attachment and walk around shut-off valve.
Then operation is so that the flowmeter from test and receive a series of flow measurement signals from first and second flowmeters of verifying attachment for the control device that preferably includes CPU (central processing unit), and this processing unit is used for the flow measurements of each flowmeter of three flowmeters from these calculated signals.Preferably, this processing unit can be operated and receive and the flowmeter and the flow measurement signal that the flowmeter that will test provides in the identical time interval simultaneously of handling verifying attachment, makes this measurement carry out under the same conditions.This can be avoided in the system for example possibility of the measurement inequality that variation produces of pressure surge.
Control device then will compare from the flow measuring data of pipeline flow meters with from the flow measuring data of the main flow meter of verifying attachment, if and should value in acceptable predictive error scope when identical, this device indicates the precision of the flowmeter in the fluid line and confirms.When if measured value is positioned at beyond the acceptable predictive error scope, this device for example should be reset on the definite indicated value of control device in the correction coefficient of the flowmeter of indication fluid line on printer or the display screen.If desired, the operator then resets correction coefficient in flow meter transmitter.
Control device is the flow measurements of autonomous flowmeter and compare from the value of check meter in the future also, and if they do not correspond to the predictive error scope, will provide indication.
Preferably, verifying attachment of the present invention will be included as the temperature and pressure sensor that control device provides the temperature and pressure measured value of the fluid that flows through this device.This will make this device always obtain density measurement in the mass flow measurement of flowmeter, and if the flowmeter in the fluid line be for example volume-displacement of positive displacement flow meter or orifice flowmeter, then computed volume flow measurements.
Preferably the fluid egress point of first flow meter is connected on the fluid intake of second flowmeter by intermediate conductor, and the temperature and pressure sensor is installed on this intermediate conductor.
Preferably first and second flowmeters of verifying attachment will be installed on the common bottom, and each is supplied and return conduit is provided with shut-off valve separately.This makes the fluid that remains in this device remain on this device when fluid line is dismantled at this device after finishing check, and the minimizing fluid overflows or loss.Shut-off valve still if desired, under the control of control device, can carry out electric operation with common manual operation.
Description of drawings
Now an embodiment of flowmeter verifying attachment of the present invention will also be described with reference to the accompanying drawings by example, in the accompanying drawing:
Fig. 1 represents the skeleton view of this device; And
Fig. 2 represents to be connected on the fluid line so that the schematic representation of apparatus of the flowmeter that uses in the check fluid line.
Embodiment
The embodiment of flowmeter verifying attachment shown in Figure 1 comprises that 1, two identical standard C oriolis mass flowmeter 2,3 of support foot is installed on this bottom side by side.The size of employed flowmeter (nominal flow rate scope) will depend on the size of needs by the operate flow meter of this device check.In the embodiment shown, each flowmeter 2,3 comprises by ELITE (TM) sensor (for example model C MF200 has 725kg/ minute nominal flow rate scope) of Micro Motion Inc manufacturing with to making response from signal of sensor so that the transmitter 26,36 (not illustrating at Fig. 1) of the accurate measured value of the mass rate that flows through this sensor is provided.Can be that the transmitter of the transmitter of the ELITE model RFT9739 that makes by Micro Motion Inc. equally can be directly installed on maybe can divide on the sensor housing and is arranged so that long-range installation and provide suitable cable to be connected on the sensor.
Each flowmeter sensor 21,31 comprises the U-shaped stream pipe (not shown) of the fluid intake 22,32 that is positioned on mounting rod 24,34 opposed ends and fluid egress point 23,33 and pair of parallel; this stream pipe is contained in the U-shaped housing 25,35 of protectiveness, and enters inlet 22,32 fluid and flow to by this stream pipe and export 23,33.Be used for vibrating flow tube under resonant frequency so as response from the vibration of the driver (not shown) of the signal of transmitter and response flow pipe so that provide an output signal to the housing 25,35 that sensitive element (not shown) on the transmitter also is contained in each flowmeter sensor.
Equally as shown in Figure 1, the flange of the fluid intake 22 of first flow flowmeter sensor 21 by bolted joints is connected its inlet end and is provided with on the fluid supply tube road 4 of manually operated shut-off valve 5 and flange connector 6.The fluid egress point 23 of first flow flowmeter sensor 21 is connected on the end of S shape intermediate conductor 7 by the flange of bolted joints, and the other end of S shape intermediate conductor 7 also is connected on the fluid intake 32 of second flowmeter sensor 31 by the flange of bolted joints.The fluid egress point 33 of second flowmeter sensor 31 is connected on the return conduit 8 by the flange of bolted joints, this return conduit 8 cooperate with manual operation shut-off valve 9 and its endpiece on flange web member 10 be positioned on the height of inlet end of the supply line 4 on the support foot 1.
Two flowmeters 2,3 are installed on the support foot 1 by the mounting bracket 11,12 of bolted joints, or otherwise are fixed on the bottom 1, and support 11 is fixed on the supporting tube 4, and support 12 is fixed on intermediate conductor 7 and the return conduit 9.
This device also comprises and being installed on the intermediate conductor 7 so that will the information relevant with the pressure and temperature that flows through this device be delivered to traditional pressure and temperature sensor 13,14 on the transmitter 26,36 of two flowmeters 2,3.As selection, pressure and temperature sensor 13,14 can be installed on the return conduit 8.
The verifying attachment of this embodiment can be used to the checked operation flowmeter, and this flowmeter has roughly the nominal flow rate scope (being 0～725kg/ minute) with the flow range identical (or in its scope) of each flowmeter 2,3 of this device in this example.Because the ELITE CFM200 flowmeter in using has ± and 0.1% precision, require the flowmeter the 2, the 3rd of verifying attachment, the flowmeter of standard, it preferably has 0.03% the precision of determining according to the ISO5168 standard (error).Proving flowmeter can be proofreaied and correct according to the gravimetric analysis shunt system, and 0.03% grade of errors means that this proving flowmeter will mate with means for correcting 95%.
This verifying attachment comprises that also with CPU or computing machine (not shown in Figure 1) be the independent control device of form, so that be connected on the transmitter of two flowmeters of this device and be connected on the transmitter of the operate flow meter that will check.
How Fig. 2 represents on-the-spot service test device to hold it in the synoptic diagram that uses in the fluid line 41 simultaneously so that test for flowmeter 40.As shown in the figure, the entrance and exit end 6,10 of verifying attachment is connected operate flow meter 40 downstreams and is positioned in the branch 42,43 of the fluid line 41 on the opposite side of block and bleed valve of fluid line 41, if desired, this device can be connected the upstream of operate flow meter.Fluid line also be provided with near operate flow meter 40 in case the information of fluid temperature (F.T.) and pressure is offered operate flow meter 40 transmitter 47 pressure and temperature sensor 45,46 and be used to control the flowrate control valve 48 of the flow that flows through fluid line.The control computer 49 of this verifying attachment is connected on the transmitter 47 of operate flow meter 40 and the transmitter 26,36 that is connected two proving flowmeters 2,3 of operative installations.In addition, control computer 49 is connected on block and bleed valve 44, control valve for fluids 48 and printer or other output units 50.
In order on operate flow meter 40, to test, flowrate control valve 48 adjust by control computer 49 in case make flow through use the fluid flow of flowmeter 40 in the optimum precision scope of the proving flowmeter 2 of this verifying attachment and 3, and block and bleed valve 44 closures.Simultaneously, the shut-off valve 5 that is connected with verifying attachment and 6 open to make sequential flow after the flowmeter 40 of fluid in flowing through check that flows through fluid line 41 cross the flowmeter 2 and 3 of verifying attachment.The transmitter 26,36,47 of control computer 49 control test device flowmeters 2,3 and operate flow meter 40, each measures fluid flow simultaneously to make it, and this flow information is transported to control computer 49 so that handle.This processing relates to by repeatability check software mainly measures, and the flowmeter 3 of verifying attachment is used as the main flow meter of checked operation flowmeter 40 thus, and the flowmeter 2 of verifying attachment is as confirming that the main flow meter reads check meter accurately.Whether control computer 49 is then accurate by the precision of output unit 50 indication operate flow meter, perhaps needs to proofread and correct by the correction coefficient of adjusting its transmitter 47 of input.
If the operate flow meter 40 in the test is configured for mass flow measurement, the analytic accounting amount uses following formula to determine the mass flowmeter correction coefficient of operate flow meter 40:
MF m＝MF masterM master/M meter
MF wherein Master=the quality measured by main flow meter 3; And
M Meter=the quality measured by the operate flow meter 40 in the test.
Determine divided by the k-factor of flowmeter from the pulse of flow meter transmitter and with the quantity of pulse by counting by the quality that main flow meter 3 and operate flow meter 40 are measured.Because the Coriolis flowmeter is very linear flow measurement device, do not use the meter factor that is used for the main flow meter usually.On the contrary, proofread and correct for the main flow meter so that output near the corresponding extreme linearity of 1.0000 meter factors is provided as far as possible.
The check of being carried out at first should long enough so that guarantee to accumulate abundant pulse, thereby reduce error in the step-by-step counting (each flowmeter should accumulate minimum umber of pulse be 10000) usually, and secondly provide the output of repetition from flowmeter.The duration of check should be less than 1 minute, and be enough still common proving time from 1 minute to 2 minutes.Preferably, should carry out at least three checks that separate.
For trimming process, operate flow meter in the test and check meter comparison are so that the value of providing MF 1=MF Test/ MF Check, and main flow meter and check meter comparison are so that the value of providing MF 2=MF Master/ MF CheckThe comparison of sensed flow meter and main flow meter can then be calculated, so that the value of providing MF 3=MF 1/ MF 2=MF Test/ MF Master
If have only the flowmeter correction parameter of a flowmeter to change, that the parameter of other two flowmeters keeps is identical (for example 1.0000).Therefore, value MF 1, MF 2And MF 3To be 1.0000 equally.
If MF 1=1.0000, MF so TestAnd MF CheckAll be 1.0000, and the main flow meter change.If MF 2=1.0000, MF so MasterAnd MF CheckAll be 1.0000, and sensed flow meter change.If MF 3=1.0000, MF so TestAnd MF MasterAll be 1.0000, and check meter change.
These results obtain summing up in following form, wherein MF ABe the flowmeter correction parameter of operate flow meter in the test, MF BBe the flowmeter correction parameter and the MF of check meter CIt is the flowmeter correction parameter of main flow meter.
??MF A ??MF B ??MF C ???MF 1＝MF A/MF B ??MF 2＝MF C/MF B ??MF 3＝MF 1/MF 2 Adjust
There is not flowmeter to change
??1.0000 ??1.000 ??1.0000 ???1.0000 ??1.0000 ??1.0000 Remarkably
A flowmeter changes
??1.0015 ??1.0000 ??1.0000 ???1.0015 ??1.0000 ??1.0015 ?MF A＝MF 1＝1.0015
??1.0000 ??1.0015 ??1.0000 ???0.9985 ??0.9985 ??1.0000 ?MF B＝1/MF 1＝1.0015
??1.0000 ??1.0000 ??1.0015 ???1.0000 ??1.0015 ??0.9985 ?MF C＝MF 2＝1.0015
??0.9985 ??1.0000 ??1.0000 ???0.9985 ??1.0000 ??0.9985 ?MF A＝MF 1＝0.9985
??1.0000 ??0.9985 ??1.0000 ???1.0015 ??1.0015 ??1.0000 ?MF B＝1/MF 1＝0.9985
??1.0000 ??1.0000 ??0.9985 ???1.0000 ??0.9985 ??1.0015 ?MF C＝MF 2＝0.9985
All flowmeters change Sensed flow meter

Claims (9)

1. the flowmeter verifying attachment of a field test flowmeter under operating conditions, it comprises: be corrected to the first and second standard C oriolis mass flowmeters that predetermined accuracy requires, the fluid egress point of connection first flow meter and the fluid intake of second flowmeter are so that the device of the described flowmeter of connecting, make this device be connected to supply and return conduit that the fluid in the fluid line on the fluid line that contains the flowmeter that will check is crossed sequential flow in the described flowmeter that will check on the fluid egress point of the fluid intake of first flow meter and second flowmeter thereby be connected to, be used to be connected on described first and second flowmeters and the described flowmeter that will check so that therefrom receive the control device of flow measurement signal, described control device can be operated so that use one of described first and second flowmeters as the main flow meter of the precision of checking the flowmeter that will check and use another check meters as described main flow meter of described first and second flowmeters.
2. device as claimed in claim 1 is characterized in that, this first and second flowmeter is roughly the same.
3. device as claimed in claim 1 or 2 is characterized in that, the accuracy correction of each first and second flowmeter to about 0.03% or littler error on.
4. as each described device of above-mentioned claim, it is characterized in that this first and second flowmeter is installed on the common floor.
5. as each described device of above-mentioned claim, it is characterized in that it also is included as the temperature and pressure sensor that control device provides the temperature and pressure measured value of the fluid that flows through this device.
6. device as claimed in claim 5 is characterized in that the fluid egress point of this first flow meter is connected on the fluid intake of second flowmeter by intermediate conductor, and this temperature and pressure sensor is installed on the described intermediate conductor.
7. as each described device of above-mentioned claim, it is characterized in that each supply and return conduit comprise shut-off valve.
8. as above-mentioned claim device as described in each, it is characterized in that this control device comprises can be operated so that receive and the CPU (central processing unit) that the flow measurement signal that is provided simultaneously by main flow meter, check meter and the flowmeter that will check is provided in the identical time interval.
9. one kind is used aforesaid right to require the method for the flowmeter in each described verifying attachment field test fluid line under operating conditions, this method comprises: on upstream that the supply and the return conduit of verifying attachment is connected to the flowmeter that will check or the downstream fluid pipeline and be positioned on the opposite side of shut-off valve of fluid line, closed shut-off valve, in flowmeter that makes fluid sequence in the fluid line flow through to check and first and second flowmeters of verifying attachment, from each flowmeter, obtain the measured value of fluid flow, to compare by the flow that one of the flow of the flowmeter survey that will check and first and second flowmeters of verifying attachment are measured, so that check the precision of the flowmeter that will check, and the flow of another flowmeter survey of first and second flowmeters of verifying attachment and the flow of a described flowmeter survey are compared, thereby confirm the precision of a described flowmeter.
CNB028109163A 2001-05-30 2002-05-22 Flowmeter providing device and method Expired - Lifetime CN1237332C (en)

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GB0113113A GB2376080B (en) 2001-05-30 2001-05-30 Flowmeter proving device
GB0113113.5 2001-05-30

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CN1237332C CN1237332C (en) 2006-01-18

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EP (1) EP1395797B1 (en)
JP (1) JP4086777B2 (en)
KR (1) KR100649848B1 (en)
CN (1) CN1237332C (en)
AR (1) AR033781A1 (en)
BR (1) BRPI0209693B1 (en)
CA (1) CA2448275C (en)
GB (1) GB2376080B (en)
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